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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cc7fdf69b528c545cab082398077297f0b8ab426abfd86c8285e92f087a024' 
  AND token = 'lZExlulwUatGGOYVrKaizpZ7Y1UmuEs+ndZ2tyVu61c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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