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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f1dda4b175c568f305807996829d5b7ce87d1db8fd3a79230afe39ddd49cdc' 
  AND token = 'V5zLS8eY28zGJdaM8YdeOVVdU89pzEzWgu+j+2Msk7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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