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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3eb36c039981fa692e10c7d5c4f2a9807a8298e32afc586b64155c6b986b440' 
  AND token = 'Ui3Qk6f94ptVkpQP2o8g2K8DOnea3AfrjhAld9eZitY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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