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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ffe7870cf49f55a1cf676d58d217b7e2ed976817f01eed803489f067b9ffc' 
  AND token = 'oW1LYmFT16pYnd85a179OACC/RecvSSihNogKrQYFNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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