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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9706eba6a9bd73735a82b9e10849864f8ebffe1f6e02731ce4775d9e8a282958' 
  AND token = '1M8JdBLkd6YsaXobYKHrWg51b5XUOerp6YeHD45Uryk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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