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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eacc3079d085984171b41a4429c58f69e0c23d6589c47c4db742c95da51e42' 
  AND token = 'UAT3IMQErkSmd+OJkpbCmk9DNkAV1v1BM5upbX8t8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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