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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c23369ca2fb80f63af942303eb4f9004d753f94518bb62aca443f1e2e5cd24' 
  AND token = 'ULPIy4Ylz/tA1aWIgIYUy6W+tlNPxDgCZlrdCFkAoyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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