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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a05b6676a2c5bc67af611deff5511b1038b90ffd3703d8628c68c92eceb12f8' 
  AND token = 'j1hwKNYJ8L5BRBkVoR0dYvqz12hBEWc0no0IHxozpvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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