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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a2857560feda5325cc317734d830deaea84d692dc5ff6d725f01358c231dfc' 
  AND token = 'oqB3RikLzgoKhG3JddN6Lk5DoGY1nGP7QG0ZqXQ7Iuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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