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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af4ce5cb3f1590c2b42eb0de400652e19dbfcbe74bbd43aa265cb61251da2b1' 
  AND token = 'H/eadCCukdo01oNNoAzWQC0He77Rj08BL7vmnNmm8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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