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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc0b55770bd75a1bca8f5a08ef22c1fb33e3947e6452c5c54c79c8a81c0a99c' 
  AND token = '0gAN3o2KiZoo+LAndPCXdxxRV0C2qZ5RfUKAsXJ5ffY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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