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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b302dc7e309825ec39e0747ff01b6932a9ccb1171b9c7bef9264f9990e6c3ef2' 
  AND token = 'Qv4nB+udUvy1BLSoHd9ib3sUFm+q7/IivJLEXDlxa1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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