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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55079620e5f6cb118a89d4bb493b4c9578edd5acbd957b3d49a6c1df9c12b4b4' 
  AND token = 'hb/p5mhIy11BlfC1VtN5OWX8kZpdmmdudK01UTpg6MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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