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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee46c8b87f2f2fadb6540136f37727daed256a00db52ac5636cfc46598bed70' 
  AND token = '0SmMLu5MI8YfFQZ5uJiPyxYp4p1B9JeJP0MjNEYdtYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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