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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a620b2a7c38f4d37c0c25cd83203bede169999a4e96de9c71d9b06753fa12713' 
  AND token = 'DxIz+ozwcHoi0EW3SspNEz7eaJ8nplIpo6na4EdzYcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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