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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec908c877eeb0c60525759d50891b53242bdc1550282d45d182eef65de33589' 
  AND token = 'LyA3XkXqb+zv1EZBSFS+yfzpIDM1LfQ910syl8Kx76I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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