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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e6259e91e9ab70c48ff627b92ba9b26be4466f1f75e20bc9dcea6c84d5e22e' 
  AND token = '/waIQeVIGRTsclWS6z/NzyCNm2aJXvCk3o7zY62uh6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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