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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0315691ded35717d7b8f4ef22a6998534fc3163b09a6c6c21aeb0033d7e38e' 
  AND token = 'NoyQOGwYSzjkgyrc9tDq9Axk8L1Zqh322RkFQE/jpJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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