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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562be6675f8c4625181cd8c114f0315958678e2171636c100cb7c4f52c3dc90e' 
  AND token = 'dLa94OO7POC9RaQrJNvg61Cwvzkv0LIPA2+hAf71XC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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