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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edc29f8c0dd1d2ad377d62e6fc8d3d13c5a1463ccc4877803dc28d7e49326ae' 
  AND token = '5CbfoT8xQmo0EKmxwhRFJEj7EyviC59gwmONXVl7mB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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