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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2711aef670527db5013c1b09a59e86897863fe6fe66a5cfeda9d01d9251fa80d' 
  AND token = 'L6vJ0ZBvNpzGo6c2433RS9zCud04F0EwWJjFyzkTnHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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