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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980688dcb88462f94c07a07dfa8aba177e3e9420832f5a520045fc9861e870f5' 
  AND token = 'FMdo3nXsq00wsEbVtfewxTmi8IkwcRTvJMj77RTz8jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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