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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f1449a1f870c8840af294c082e2a4e2dc4a3213af60fca3ed2b6c0047f4a24' 
  AND token = '1LlksCPA8CgYRBGBuleQYgfbwYibPm6sFtaCb+TVS0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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