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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f806d8f7a6fd1fc313117e8c7f7eaced4445fe53b220308ac195e6f80aaa15' 
  AND token = 'bDvVaJBvV6vTt3dXoJL2qxSLwJ6U05PvfDxlUGOMV3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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