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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb7d8c89172ce5156ea7d10dd74e2d39eb7a18010032f25e21e607e79174fdd' 
  AND token = 'locVNKN6Y/u0wJS5BXwFaSAwnMav+eiq32vIr7Nzndo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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