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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae7ef089589f3959759cdc44adca9e40843accc9ca51e6bda28ac48e82a5928' 
  AND token = 'nlPeXtKwKRu6ToP/WtUlyWtyh74nLKOIn6L9ZBv735U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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