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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611d8a1bb41e7ec884fcf47923bd5ff7a4d4d79ef0673c01bd157277d8c15bf0' 
  AND token = 'Cj3/EGU6/K7uwqGpIJauohxcIwl1ONK7Hke/312TnxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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