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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b485bbd5340874cbf0a4793f32f4008192e0ff5802e7d9f8eb01c5cb09c96a13' 
  AND token = 'HKUeqGrkBVorfT32OnuTa4LaiJn6fj1/EOnwE3cUj+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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