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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cac8ee98ff54917cdbdb868c7b72569f3f0c517eddb54d1fbbfacbd5eab701' 
  AND token = 'xpsYcKRgi60S56bw9nF0hw/BIYDhj+sb4mP+PAFNRxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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