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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8772db5efd0d61e3fd7577adc78bb94b6bdd9cc4d7d91c6e371390f48aa9e40f' 
  AND token = 'CwdckJ4vDGwFaGp+EV8nU/BiaK9rIDmYGNj3ti8pQfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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