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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967e1ca7c0a2890f5242c3d769b7509070dc3db435301fb48a12105a80af390b' 
  AND token = '4KPX1Ua5F/cvv73Q+KTyplw+emFQ3jlRrzHR1OlagXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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