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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5062afce1f087d958320ecf1d10e26dcc221dcd5f6a6db4cf25bbe1e526f890' 
  AND token = 'CwbpTxsROaPq4dfEXWiLWab41z9FL1LxltDvgL3vXZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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