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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0393b2be08aa6990a3c4f7a8d1ab99b0ef7f3e37725430a6eb86c53337f16e' 
  AND token = 'IjCGZleCsPEoRKEgm+pPXHwGAGdNVHLL2JT+Ga7ikR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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