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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49c6ddf83ce751a50dd114e1f354663af6b358a446d2617ae753e8a06f563f6' 
  AND token = '4P1CUnqnLj6W8KwXTteHMZGcrKFyxXe8dFjhxvbX45Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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