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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11d8b352bd87c64a406ffa4f8ba12a4baf249bfb9167b8a26323e1c87f8e62d' 
  AND token = 'm7rc+iIamIKM2X+F0bRkBrGh3IKctRGpAyCptBxK0dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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