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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a150edd886ee2516fdbeab92698ac082fa1d8d60736de7e6ff3c4c2a8748613e' 
  AND token = '4g+6kNA4VPalnt8RRFuER3V3UpdHV2g50CtXIfpnMRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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