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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03053134d98069a44572aeacdc993898ce473679809cfad715028be3347d238e' 
  AND token = '9euN/T3DwIQy/qZbYcRQx88aJEmq5EqOnRlZNOSuzMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00156

JSON explain

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