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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03915b96620e0ae12e7cad83436c49579caf0b7444a6c4464a2ca44016315fe7' 
  AND token = 'XxQzbcF1AqwaOC4JdLEq7bGtVVlhZZntJbVII7TiWpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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