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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7216292ccb01ae68d714a3ddf4dd8b60753706a6ef86e54e2f228667f580ff4' 
  AND token = 'gG/NchpOeWe7/sHWAK7K8SvvKbkKrqdJ3cKaov5+97o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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