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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84f6177008a2cc40ef74ff0660e78cb60bb6c34717bf44cd100ded2d3f9ac4d' 
  AND token = 'syJNikTJ5q+SFracGUSVPnTWRqskvRw2lXwRtU5EHos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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