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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a35447dd1746e2b8307a406eb881cad1e97c254402dc56cac4dc062cf15a3a1' 
  AND token = 'W3mPxeQE48+NghgiCxCZi7qd5ZCq7eALZe5LmS65m/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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