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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa01ac82161e5c12a3520f59f52a475c22176436a7f05b3d91fae9b7cf71c12' 
  AND token = 'MqpJs0kbW19ocvVd9MCF2CBDBamljNnLHw287Sj3yLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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