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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826576aad712bc7c4e33d9ef9c2c5cbf1cdc1ac4153715121ca9bbf78af63621' 
  AND token = 'i0Ac5rTd++QaQ20AUV//e/167bYErI3RznERukb2MSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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