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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99b092f7d09cf775cc1fafb309c919006d7cfb795e40dd38228fd360407aada' 
  AND token = '00WKYt+PGFVlkjRuoWZQ6BohtVo+xQbBTt30TbQWqOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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