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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430541bbb3f93b819d2f29b2d9acd7f67bd44f69757deaf1823d7a28619a84c5' 
  AND token = 'vO56QKpH21iMGy1v6KWjki2Ej3rHtw5BAQlMc+HClCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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