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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1be2321e0cecb0fc2c933c6ac00b6e4e04ee0e93c790828a2a577088aba5b3d' 
  AND token = 'uUdMHmYTbeQGMt6RXM69a6fxZgL6TU5MNFnGjOwD1DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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