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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e0bb309440bd9eccdcab68ac9218df915e258458ed57c82598658d2ede65f0' 
  AND token = 'mnaZi4khrmRm1ZTU/7hY0QJZPFU6jxjgy6ATfTJz1kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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