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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5106ea3836917ab3923f1b01c7d4036e9061b9601cb08d73cda44ffbbbd6e60f' 
  AND token = 'XIgLL8Aq3iGC2FO6EDho3XOEQl3D1hBAOvnyHAjEnNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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