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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaa145eea68af46c11fa0330c37c5d3d2d0274cbfa4019a00274c6d43605d07' 
  AND token = '5Ssc7ND3pZd9lR7pg4rIvcbzAG7pPYW30+iKa3M6MRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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