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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9120e86e3c6dea6cc143d8d6f84823587fbc7486ba703d3ef13b425cca5dc830' 
  AND token = 'ukv0Yx8HRWoKxaOGwJhGmM5MLumX01q7RtBykuaS9TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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