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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9ed01db5de0e5e9f9e84787d510ffcc1176ed548c093676febae4b4557f8b2' 
  AND token = 'sXu6iiwkUB5+zIDmuVHAGB0WpIfHtgMWTLSnIH+REwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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