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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce00a66504b91ac22c43bdcd749a8536e4c99bf7e92e2cf087154c3c941b90b' 
  AND token = 'EZ+ajdOjD7TbAtTTg8vWn6r++EWqSLLNoOrsPuBbhMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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