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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f627f803a4aa4e84be5c889ce93e248d2f311b701c3d81ebdffd6bbd2e565980' 
  AND token = 'W3HqPUPCwmg1wVPoIe8SXUJhLmJ7bkRxQmgkf/fP/mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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