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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002d6322eec8e0be7b83ea340b7b35eba1e9b6d918a23f8b178d0407254948f8' 
  AND token = 'nZ8YZkIR/E9Zw7g4p5RSDFH87bSMj45KBw0RlCYHZgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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