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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1f844995fab62682ac55a613e48baa278504544c77499918f4a280465da594' 
  AND token = 'Ml0OqPpogLoSB3h6l2IBAgVfbl+AZ6lyq4nwL0eaiog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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