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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c59e696f2b58e1b4a36abdb25c665730ed3444320b0ef66cb81bbaef51d348b' 
  AND token = 'AID0EoJ2jslpyK/kq5EfBukfMTRNc6PDg3NHO84rmJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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