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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e9fb6f805157cac66d331c4a254fac0042b618d078fed1a4f573f495027d93' 
  AND token = 'XNcvUoU9UKSaiNd61WSyg6mccr8dm2Ug9kSymi8Gat0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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