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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed6b28e2c9ee85c9c39179b6f14296812d483ee40a65ff5b0f0c81084ada88c' 
  AND token = 'yDGqCQ4dteYOkL/rLSNaDLXiC648S/TzRgV9HvydCdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}